JPH0918454A - Error correction method for data signal - Google Patents

Abstract

PURPOSE: To shorten transmission time by transmitting plural data signals including error addition information, calculating the error addition signal in unit of data signal on a reception side, setting only the data signal in which coincidence is obtained by comparing/collating with error detection information sent with it as reception output and disabling to issue a re-transmission request to a transmission side. CONSTITUTION: A transmitter 1 transmits the plural data signals assembling additional information for error detection in advance and the error detection information to a receiver 2 as transmission signals. The data reception circuit 21 of the receiver 2 receives them, and outputs the data signals to an additional information calculation circuit 22, and the error detection information to a detection information comparator 23, respectively, and they are stored. The error detection information comparator 23 compares and collates the error detection information with the error addition information of each data signal calculated in the error addition information calculation circuit 22 sequentially, and stores the data matched signal is stored in a reception data storage circuit 24. Reception data is generated by outputting such data signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data signal error correction method, and more particularly to a data signal error correction method in which real-time performance is important, such as a pager system call signal.

[0002]

2. Description of the Related Art Conventionally, when an error is detected on the receiving side by a method such as an exclusive OR or a CRC method, this type of error correction method requests the transmitting side to resend the error block. , The same data is retransmitted to correct it.

[0003]

As described above, in the conventional example, when data retransmission is requested by error detection, it takes a certain time to re-receive the data. In particular, when a real-time property is required such as a ringing signal of a pager system, there is a problem that the waiting time becomes long.

[0004]

According to the data signal error correction method of the present invention, a plurality of data signals containing error additional information for error detection are listed on the transmitting side and the tail end corresponds to the error additional information. A transmission data signal having a frame structure in which error detection information is arranged is transmitted, the error additional information of each of the data signals received at the receiving side is extracted, and this additional information and the received error detection information are compared and collated and matched. Only the data signal is output.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of this embodiment of the present invention, and FIG. 2 is a frame configuration diagram of a transmission data signal.

The transmitter 1 transmits a transmission signal to the receiver 2 connected to the transmission line 3. As shown in FIG. 2, this transmission signal includes three sets of the same data signal in which additional information xx for error detection is previously incorporated, and error detection information xx
It is composed of

Receiving the transmission signal from the transmission signal 1, the receiving device 2 receives the data signal received by the data receiving circuit 21 in the error additional information calculating circuit 22, and receives the error detecting information in the error detecting information comparing circuit 23. Stored in memory. The error additional information calculation circuit 22 calculates error additional information XX from the stored received data.

The error detection information comparison circuit 23 compares the stored error detection information with the error additional information calculated by the error additional information calculation circuit 22. The error detection information comparison circuit 23 instructs the error additional information calculation circuit 22 to store the matched reception data in the reception data storage circuit 24. The received data that is not consistent is discarded.

That is, in this case, the received signal receives three data signals, but the error additional information included in each of them is XX
Are calculated and compared with the separately detected error detection information (which is set to the same value as the error addition information in this example), and only the matched data signal is held and output in the reception data storage circuit 24.

The error addition information is exclusive OR, CRC.
A method or more complicated additional information may be used.

Further, although three identical data signals are transmitted in the present embodiment, they may be increased or decreased depending on the quality of the transmission path.

[0012]

As described above, the data signal error correction method of the present invention receives the same data a plurality of times and outputs only the data signal matched with the error detection information. As long as the received data signal does not become incorrect, it is not necessary to make a retransmission request, which has the effect of shortening the transmission time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a frame configuration diagram of a transmission signal in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 transmitter 2 receiver 21 data receiving circuit 22 error additional information calculation circuit 23 error detection information comparison circuit 24 received data holding circuit 3 transmission path

Claims (1)

[Claims] 1. A transmission data signal having a frame structure in which a plurality of data signals containing error additional information for error detection are listed on the transmitting side, and error detection information corresponding to the error additional information is arranged at the end of the data signal. A data signal characterized by extracting the error additional information of each data signal received at the receiving side, comparing and collating the additional information with the received error detection information, and outputting only the matched data signal. Error correction method.